ZAKα-driven ribotoxic stress response activates the human NLRP1 inflammasome

Kim S. Robinson, Gee Ann Toh, Pritisha Rozario, Rae Chua, Stefan Bauernfried, Zijin Sun, Muhammad Jasrie Firdaus, Shima Bayat, Rhea Nadkarni, Zhi Sheng Poh, Khek Chian Tham, Cassandra R. Harapas, Chrissie K. Lim, Werncui Chu, Celest W.S. Tay, Kiat Yi Tan, Tianyun Zhao, Carine Bonnard, Radoslaw Sobota, John E. ConnollyJohn Common, Seth L. Masters, Kaiwen W. Chen, Lena Ho, Bin Wu, Veit Hornung, Franklin L. Zhong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)

Abstract

Human NLRP1 (NACHT, LRR, and PYD domain-containing protein 1) is an innate immune sensor predominantly expressed in the skin and airway epithelium. Here, we report that human NLRP1 senses the ultraviolet B (UVB)- and toxin-induced ribotoxic stress response (RSR). Biochemically, RSR leads to the direct hyperphosphorylation of a human-specific disordered linker region of NLRP1 (NLRP1DR) by MAP3K20/ZAKa kinase and its downstream effector, p38. Mutating a single ZAKa phosphorylation site in NLRP1DR abrogates UVB- and ribotoxin-driven pyroptosis in human keratinocytes. Moreover, fusing NLRP1DR to CARD8, which is insensitive to RSR by itself, creates a minimal inflammasome sensor for UVB and ribotoxins. These results provide insight into UVB sensing by human skin keratinocytes, identify several ribotoxins as NLRP1 agonists, and establish inflammasome-driven pyroptosis as an integral component of the RSR.

Original languageEnglish
Pages (from-to)328-335
Number of pages8
JournalScience
Volume377
Issue number6603
DOIs
Publication statusPublished - Jul 15 2022
Externally publishedYes

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ASJC Scopus Subject Areas

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